Electric motor



s F. BRIGGs ELECTRIC MOTOR Filed Aug. 28. 1922 5 Sheets-Sheet l Dec. 4,1928.

S. F. BRIGGS ELECTRIC MOTOR Filed Aug. 28, 1922 5v Sheets-Sheet 2 Dec.4, 1928.

S. F. BRIGGS ELECTRIC MOTOR Filed Aug. 28, 1922 s sheets-sheet PatentedDec. 4, 1928.

- UNITED STATES PATENT OFFICE.

'STEPHEN F. BRIGGS, 0F MILWAUKEE, WISCQNSIN, ASSIGNOR, BY AMESNIL4ASSIGN.

MENTS,'TO EDWIN B. H. TOWER, JR., OF MILWAUKEE, WISCONSIN.

ELECTRIC Moron.v

Application led August 28, 1922. Serial No. 584,691.

This linvention relates to electric motors.

It relates. particularl to electric motors adapted to be employe inelectric horns or for various other purposes.

An object of the invention is to provide an efficient, compact,inexpensive and readily assembled and disassembled motor.

In accordance with this invention, the

motor comprises three separable units; the field frame, the armature,and the brush holders. I

The motor armature has a thrust bearing and .a removable bearing, and isremovable from the motor endwise through the field frame.

The brush holders are each provided with an open pivotal bearing and areremovable by merely being withdrawn from thev bear- In order to moreparticularly set forth the invention and to illustrate one purpose forwhich it may be employed, the motor is shown in the accompanying rawingsas being used with an electric horn. V

The views of the drawin are as follows:

Fig. 1 is an elevation of a orn and a motor used therewith.

Fig. 2. is a rear end view thereof.

`Fig. 3 is a longitudinal section. thereof leaving the armature of themotor 1n elevation.

Fig. 4 is a sectional view on line 4-4 of Fi 3 toward the face of themain pole.

Fig'. 5 is a sectional view on line 5--5 of Fi 3.

Fig. 6 is a sectional view on line 6-.6 of Fi 3.

Fig. 7 is a sectional view on line 7-7 of Fi 3. y

Fig. 8 is a sectional view on line 8 8 of Fi 3. t

Fig. 9 is a front end v1ew of the motor. Fig. 10 is a perspective of thesound box and resonator of the horn.

Fig. 15 is a perspective View of the bracket from one side. i

Fig. 16 is a perspective view of the bracket from the other side.

Fig. 17 is a perspective view of the insulating connecting lug.

Fig. 18 is a circuit diagram showing the motor schematically.

The mot-or 2 comprises in general a field frame, an armature, bearingsfor the, armature shaft, brush holders, commutator, and a motor cover orcasing.

The field frame has a field core 15 projecting inward from the sideplate 13', a main pole 15 -thereon and a winding 16 therefor.

The side plate 12 forms the opposite pole and is magnetically connectedto the main pole through the field frame.

The field magnetism flows from the main pole through the field frame tothe opposite are mounted upon a shaft 22 between the field, 35

poles, it being located eccentrically within the motor or field frame.

The armature shaft has a thrust bearing 23 at one end and a removablebearing 24 at the other end.

The end thrust bearing 23 is threaded into therear field plate 10 andhas therein a bearing ring 26 4in which the shaft rotates.

n order to keep the thrust bearing from accidentally turning, it is heldby a spring pawl 27 which engages serrations 28 in the end thereof.

The removable bearing 24; is formed by a circular bearing plate inwhichthe shaft rotates. y

This bearing plate may be held between the field frame and the sound boxand arranged between-the actuator and the armature.

The motor or lfield frame has an eccentric one thereof will b tis lil

opening 29 therein through which the armature may be nassed end-wise oraxially to remove it from the field frame orplace it therein.

iThe removable bearing plate is kept from moving laterally and turningby a metal plate 3() which is fastened thereto and fits within theopening 29 and has a, lug 3l which enters a notch 32.

The armature shaft is provided with a collar 33 located between theremovable bearing plate and the armature and provided with a set screw34. this collar serving to limit the armature shaft in its forwardend-wise move- .1 'y l @he armature sliart may be adjustedlongitudiiiallv bv turnine the ad ustable thrust -1 J #a nearing.

two bruslholders 35 are alike so onl e described. rlie brush holdercarries at one end a brush 36 for the coniinutator and has at its otherend an open pivotal bearing from which it may be removed by merelybeine" withdrawn therefrom.

rlhe brush is held in position by lugs 37 to which it may be soldered.

The open pivotal bearing is formed -by e bracket 38 which has a pivotedge 39.

The brush holder bears and pivots upon the pivot edee and has a .Groovel0 to receive .V1 i *n C unis pivot edge.

rEhe open oivotal bearing may be formed ot ways, the purpose being toprovide a pivotal bearing from which the brush holder may be removed bysimply withdrawing it therefrom.

The bracket has lu s ell at the ends of the pivot edge to keep the rushholder from moving side-wise, and the pivot edge entering the Groovekeeps the brush holder from turning iaerally..

ine bracket is providedrvith a terminal r making electrical connectionthereto. M.e brush holder is connected to a helical or coiled spring i3by an insulatingr lug 44, tliishlug being located in a slot 45 in thebrush holder and provided. with a head ed to 'fasten it i. the brushholder.

ne spring draws the brush holders towards each other and thereby keepsthem in position upon the brackets and causes the shes to press upon thecommutator.

The two brackets are fastened upon the side i2 by rivets i8 andinsulated from this e brackets have opstanding 'lugs 51 Lcli ,enterslots in the insulating plate 49 to them from turning.

ine motor is electrically connected to the source of current through twoinsulated binding posts 52 and 53 which are mounted upon tne endplatei0.

The binding post 52 is electrically connectand 'each other by insulatingplates 49 ed to one terminal'of the field coil, and thc l binding post53, field coil 16, bracket 38, brush holder 35, brush 36, armature 20,brush 36, brush holder 35, bracket 38, binding postv 52, switch 54, backto the battery.

The motor is provided with a cover 55 which is preferably made frommetal sheet bent into cylindrical form and having the ends thereofhooked together.

These hooked ends form a longitudinal rib 56 upon the inside of thecover.

The cover fits over the'field frame end plates, and the longitudinal rib56 enters a notch 57 therefor in the end plate l0 to keep it fromturning.

The cover is fastened to the field frame by ascrew 58.

The motor 2 is shown as detachably fastened to the back of a horn soundbox.

This horn comprises, in general, a sound borL 1, and a resonator oramplifier 3 pro- 4 casing plates 7 and 8, the edves of which are unitedto ether and hold t erebetween the edges of t e diaphragm.

The front plate 8 has "af' central openin which communicates -with the"resonator an the back plate has an eccentric opening 9 through which theactuator may pass in applying and removin the motor.

The parts which orm the horn are mainly made from stamped metal.

It is, of course, to be understood that the motor, although shown asapplied to a horn, ma be used for various other purposes.

s previously pointed out, t e motor comprises a field frame, anarmature, the brushholders, and the motor cover or casing, each of whichis a unit that may be readily removed for the purpose of being repairedor replaced. y

These units are of such lform that they are durable, practical andcapable of being easily and cheaply manufactured.

Of course, various modifications and adaptations may be made in themotor, Within the purview of the claims, without departing from theinvention.

The invention is hereby claimed as follows:

1. An electric motor comprising a field frame having side plates toprovide and support Opposite poles and end plates to connect said sidelates, an energizing winding for said eld rame, an armature arrangedbetween said side plates and removable endwise through an openingtherefor in one of said end plates, and a removable bearing platearranged across said opening to support said armature.

2. An electric motor comprising al field frame having a side plate tosupport a main pole and another side plate to provide an opposite poleand end plates to connect said side plates,-one of said end plateshaving an opening through which the armature may be removed end wise, apole piece attached to one of said side plates, -an energizing windingarranged on said pole piece, an armature arranged Within said fieldframe between said pole piece and one of said side plates and removableendwise through said opening, and

a removable bearing plate arranged across said opening and having abearing for said armature.

l3. An electric motor comprising a field 9mm Nu. 1.694.241.

frame having a side plate to support a main pole and another side plateto provide an op osite pole and end plates to connect said si e plates,one of said end plates having an opening through which the armature maybe removed end wise, a pole piece attached to one of said side plates,an energizing winding arranged on said pole piece, an armature arrangedwithin said field frame between said pole piece and one of said sideplates and removable endwise through said opening, a removable bearingplate arranged across said opening and having a bearing for saidarmature, and commutator brushes carried by one of said side plates.

4. An electric motor comprising a field frame having a side plate tosupport a main pole and another side plate to provide an opposite poleand end plates to connect said side plates, an energizing Winding forsaid field frame, an armature arranged Within v said ield frame betweensaid side plates and having bearings arranged in said end plates,

and commutator brushes ivoted on bearings carried by said frame an heldin place upon said bearings by a spring arranged between the same.

scribed my name.

STEPHEN F. BRIGGS.

Granted December 4, 1928-, to

ff l srEmEN r. muccs.

lt ia hereby certified that error appears in the printed specificationof the i `abovenuinberetl patent requiring correction as follows: Pagel, after line insert' the following.

Themotor or field frame is formed from two circular end field pines 1Qand ll and two. side field plates l2 and 13. t

` The side plates :and the end plates are fastened together by rivetedprojeptions 14 formed uponthe ends of the side plates and projectingthrough openings therefor in the'end plates.; page 2, line 79, after theword "from" insert article "a"; and that the said Letters Patent shouldbe read wit-h these `correptions therein that-the same may conform t0the record of thc case in the Patent Office. v

signed mi mlea :his 29th any of october, A. D. 1929.

vM. Moore, i

,(Segl') Acting Commissioner of latenta.,

